Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a first embodiment;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a second embodiment;

FIG. 7 is the second image thereof;

FIG. 8 is the third image thereof;

FIG. 9 is the fourth image thereof;

FIG. 10 is the fifth image thereof;

FIG. 11 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing the design ofFIGS. 1 through 5, but with an alternate broken line environment;

FIG. 12 is the second image thereof;

FIG. 13 is the third image thereof;

FIG. 14 is the fourth image thereof;

FIG. 15 is the fifth image thereof;

FIG. 16 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a third embodiment;

FIG. 17 is the second image thereof;

FIG. 18 is the third image thereof;

FIG. 19 is the fourth image thereof; and,

FIG. 20 is the fifth image thereof.

The outer perimeter shown in by a pair of dashed broken lines in thedrawings represents a display screen or portion thereof and forms nopart of the claimed design.

The remaining dashed broken lines in the drawings illustrate portions ofthe transitional graphical user interface that form no part of theclaimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-5, 6-10, 11-15, and 16-20,respectively. The process or period in which one image transitions toanother image forms no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.